Rectifier.



No. 728,812. PATENTBD MAY 19,1903; W. STANLEY.

RECTIFIER.

APPLIOATION FILED 001228, 1897.

2 SHEETS-SKEET 1.

INVENTOR Jinn/g9.

ATTORNEY I FATENTED MAY 19, 1903. w. STANLEY.

RECTIFIER.

'APYLIOATION FILED 00128, 1897- HMS-sum 2.

. 10 MODEL.

I mvamom Filmmsip/12 WIT SSES ATTORNEY u: norms PETERS ca, flavourowAsulm. 04 c1 UNITED STATES WILLIAM STANLEY, OF PITTSFIELD,

Patented May 19, 1903.

PATENT OFFICE.

MASSACHUSETTS, ASSIGNOR TO THE RECTIFIER.

SPECIFICATION forming part of Letters Patent N o. 728,812, dated May 19,1903.

Original application filed March 10, 1897, Serial No. 626,728. Dividedand this application filed October 28, 1897p Serial No. 656,643 (Nomodel.) 7

To all whom it may concern: v

Be it known that 1, WILLIAM STANLEY, a

citizen of the United States, residing at Pittsfield, Berkshire county,Massachusetts, have invented certain new and useful Improvements inRectifiers, of which the following is a full, clear, and exactdescription. 7

My invention relates to improvements in apparatus for convertingphase-differing al- 7 application filed March 10, 1897; Serial No.

The following is a description of an apparatus embodying my invention,reference being had to the accompanying drawings, in,

Which Figure l is a side elevation of the system embodying my invention.Fig. 2 is an end view of one of the rectifiers,the shaft of which, whichis mounted, being in section. Fig. 3 is a side elevation of the same.Fig. 4 is a sectional view showing details.

Heretofore rectifiers for phase-differing alternating currents have beenused in which two or more currents diifering in phase have been fed intoan armature having a gramwinding or its equivalent at points separatedfrom each other by an angular difference-corresponding With thedifference of currentphase. The windings have been tapped at numerouspoints, each such point being con nected to one of a number ofcommutatingplates, upon which a pair of brushes bear in the ordinarymanner. This armature has been free to revolve in a separately-excitedmagnetic field, and the alternating currents have been fed to it bymeans of collectingrings. The field in which the armature revolves hasbeen either excited from an independent source or excited by thecurrent-rectifier. In such an apparatus the supplied alternatingcurrents acting successively upon the separately-excited field produce atorque, causing the armature to revolve. The coils of the armature as itis revolved cut through the linesof force of the separately-excitedfield, and there is thereby generated in them an electromotive forcetending to oppose the electromotive-force of the supply-alternatingcurrents. This electromotive force (the electromotive force due torotation in the separately-excited field) canequal and oppose theimpressed electromotive force only at one critical value of theifieldstrength, which nocessitates adjustment of the exciting fieldcurrent forvarying impressed electromotive forces. Such apparatus has the ponderousfield-magnets of the motor and is the equivalent of a motor andgenerator combined therewith and operated thereby and lacks theadvantages of my improved apparatus, which dispenses with theseparately-excited field, and on that account'is much more simple in itsmethod of operating and also in its construction and produces betterresults.

Referring to the drawings, A A A represent three of my rectifyingdevices, each consisting of arevolving armature, upon which is clamped alaminated ring or keeper L, the laminations I being iuplanes at rightangles to the shaft 0, which is a revolving shaft, carrying'the saidarmatures, together with the rings or keepers clamped thereon. Each ofthese armatures has a gram-winding or its equivalent, which is connectedby the couductors D D D D at four points or, according to the number ofphase-difiering alternating currents, to the collecting-rings d d d at.At regular intervals each of the windings is connected by conductors Ito contactplates 11 upon the collectors upon which the brushes J J bear,to which are connected the terminals of the work-circuit W. Uponconnecting the contact-rings d" d d d to the source of currents inquadrature S by brushes E E E E a magnetic field is established,rotating relatively to the armature C and the keeper L, which field asit cuts'the conductors of the armature produces byinduction electromotiveforces which coincide in phase with and oppose the alternatingimpressed electromotive forces-thatis to say, the magnetizing componentsof the supplied currents lag ninety degrees behind their respectiveimpressed electromotive forces and cause a resultant magnetization whichinduces in the armature-winding electromotive forces counter to thephase-differing electromotive forces impressed whose maximum pointscoincide with the points of maximum electromotive force due to thecombined action of the currents in different phase. These points ofmaximum electromotive force are maintained in communication with theterminals of the work-circuit, as hereinafter described.

The collecting-brushes E E E E are mounted upon stationary supportsrising from the base M, as are also the brushes J J, bearing upon thecommutator and constituting the terminals of the work-circuit W.

To the shaft 0 one or more synchronouslyrunning motors P are attached.The synchronous motors P operate so as to revolve the armatu re,with itskeeper L,in the opposite direction from that in which the shiftingmagnetic field progresses in the armature and ring or keeper of therectifier and at the same rate of speed, with the result that the polarline in the rectifier remains stationary in space and also stationaryrelatively to the brushes upon the commutator. The points of maximumpotential therefore are also relatively stationary. The brushes J J areadjusted so as to make contact with the commutator at these points, andconsequently the maximum points and the points of brushcontact remainthe same so long as the synchronous speed is maintained. In such aconstruction the magnetic field due to the phase-differing currentssupplied from the main operating the motor, though stationary in space,revolves relatively to both the armature and its surrounding ring,producing the electrical action heretofore described.

The apparatus which I have described as embodying my invention isdesigned to be operated by currents in quadrature. I do not, however,intend to imply that it could not equally well be used with currents ofother phase differences.

The number of rectifying devices connected to the shaft 0 may be one oras many as the motors can drive.

What I claim is 1. In a rectifier for alternating currents of differentphase, the combination of a revoluble core, a winding thereon, said corehaving an external laminated portion or keeper clamped thereon,surrounding said winding and in closeinductive relation thereto, acommutator having its segments connected with the winding on said core,all of said parts being mounted upon a rotatable shaft, conductorscarrying currents of different phase, means for connecting said windingwith said conductors, and asynchronous motor coupled to said shaft.

2. The combination of a core, a winding thereon,- a keeper secured oversaid Winding, a commutator having its segments connected to saidWinding, collecting-rings also connected to said winding, and asynchronous motor for revolving said core and the winding thereon.

Signed at Pittsfield, in the county of Berkshire and State ofMassachusetts, this 26th day of October, 1897.

WILLIAM STANLEY.

Witnesses:

H. M. PLATT, O. A. BURGHARDT.

